Here's the reply i got b ack from Boretech Bullets
Thank you for contacting us.
The .338 245s are a match bullet with excellent accuracy. We have
customers shooting one hole, 5 shot groups @ 100 yards. These bullets
do take some time to find a good load, but once you do watch out! Some
things to keep in mind, 1:10 or faster twist, 3,000+ fps, and jump the
bullets 0.050" - 0.090
As far as performance on big game, we do not have enough data to provide
a definite answer. We do know that if shooting a thin skinned animal
(deer) at under 100 yards is not good. Bullets are moving so fast they
just poke a hole in both sides. We have seen that at the further
distances 500+ yards that the bullets slow enough to do more internal
damage and help drop the animal. These bullets probably would do better
on true "big game" where they need to penetrate bone, thick hides, etc.
The accuracy is still that of a match bullet though!!!"
Sounds pretty good to me I am going to try these out